The Last Samurai(2003) [Katsumoto]: Commits suicide by hara-kiri (with Tom Cruise assisting by holding the sword), after being shot while charging into battle against the Japanese army. (Thanks to Mathew)

Batman Begins(2005) [Ra's al Ghul]: Crushed to death by falling debris during a battle with Christian Bale in a burning temple. (Thanks to Mathew)